City multi VRF MITSUBISHI
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City Multi 
VRF & Hybrid VRF Air Conditioning Systems

City Multi is the market leader 
in VRF technology
Today’s buildings need to provide so much more than just a comfortable space for occupants.
Tough government regulations and stringent environmental 
targets on carbon emissions mean building owners are now 
demanding future-proof technologies that reduce running costs, 
improve indoor air quality and provide optimal energy efficiencies.
Our answer to these challenging demands is the City Multi VRF 
and Hybrid VRF air conditioning systems. First developed 
over 30 years ago, City Multi is now the market leader, with 
a comprehensive range of systems that continues to grow 
through smart innovation.
 

City Multi delivers complete flexibility of design and 
installation. With intelligent, centralised control, these 
systems can be used in a wide variety of applications 
such as offices, hotels, hospitals, retail spaces and 
public buildings.
This brochure provides a comprehensive overview of 
the City Multi range, including features and benefits, 
legislation and market challenges.
Mitsubishi Electric VRF is the first name 
for comfort and efficiency
for comfort and efficiency 
Mitsubishi Electric was founded in 1921 and brings over 100 
years of innovation and experience to the building services industry, 
as a global market leading environmental technologies manufacturer.
Mitsubishi Electric Living Environment Systems provide 
pioneering solutions that heat, cool, ventilate and control 
our buildings.

The challenge to 
Reduce Carbon Emissions
In the UK, buildings account for over 40% of our carbon emissions, and nearly 90% 
of this is generated from heating and cooling systems.* The use of more energy efficient 
equipment means that operational costs are lowered for building owners, and the impact on the 
environment is reduced - helping us all adhere to corporate and social responsibility directives.
The reduction of carbon emissions
As part of the global roadmap to achieve net zero carbon, ambitious standards are being set for 
the energy performance of new and existing buildings. As a result, the UK needs to develop, 
adapt and embrace new cleaner technologies.
 

Refrigerant & Installation standards
The growing pressure of the F-Gas phase down regulation sees the market demand viable and positive solutions. R32 is a highly 
efficient refrigerant that is easy to recycle and is now the norm for large-scale room and split air-conditioning systems offering a 
lower Global Warming Potential (GWP) than R410A.
We remain the only manufacturer able to offer a complete range of R32 solutions from large scale VRF and HVRF systems, to splits 
and single room units. Our R32 models offer customers a future-proof solution that is fully flexible in design, reduces operating 
costs and simplifies maintenance regimes. In addition to lowering the Global Warming Potential (GWP) of the air conditioning, the 
use of R32 means that less refrigerant is required and our ability to supply large, medium and small systems means that a single 
refrigerant can be used across an entire building or estate.
BS EN378 is an installation standard designed to improve safety in the unlikely event of refrigerant leaking from an air conditioning 
system. Current UK legislation places limits on the use of refrigerants in buildings, with BS EN378 in particular intended to minimise 
possible risks to persons, property and the environment from refrigerating systems and refrigerants.
Energy Efficiencies
The London Energy Transformation Initiative (LETI)
The LETI has set the ambitious target that by 2030, all new buildings should operate at annual net zero carbon emissions. 
In addition, the LETI Industrial Strategy has set out ‘Grand Challenges’ that will help to put the UK at the forefront of the industries 
of the future. This includes the government’s approach to bring businesses and organisations together to make a real positive 
impact on how we live our lives.
Part L
Part L of the UK Government Building Regulations addresses the conservation of fuel and power in a building. It outlines how 
building services such as air conditioning can help comply with carbon reduction targets. The Non Domestic Building 
Services Compliance Guide (NDBSCG) sits alongside Part L and outlines technical information and calculations to help 
building professionals comply with planning regulations. Both Part L and NDBSCG are advisory documents that give 
guidance and suggested methods of carbon reduction.
BREEAM
BREEAM is an international sustainability assessment method used in the planning of new projects; it recognises the 
value in higher performing assets across the built environment from new construction to refurbishments and in-use buildings. 
Certification is achieved with a third party assessment - by impartial experts - of a building or project by a qualified 
and licensed BREEAM Assessor to ensure that it meets the quality and performance required.
Mitsubishi Electric’s approach is to develop innovative, energy-efficient solutions for our 
customers, that will help the UK to meet the targets being set now and in the future.
City Multi 
Seasonal Efficiencies
The whole building industry is being targeted to create ‘greener’ more sustainable 
buildings and to equip them with air conditioning systems that provide the very best, 
long-term performance in terms of energy efficiency, ease of service and maintenance, 
as well as occupant wellbeing.
The Ecodesign for Energy-Related Products
The Ecodesign Directive for Energy Related Products (ErP) (Amendment) (EU Exit) Regulation 2020, is a European legislation 
designed to improve the energy efficiency of all products which “generate, transfer or measure energy” - whether through 
electricity, gas or other fossil fuel. Introduced in 2009, the ErP legislation covers a broad range of domestic and commercial 
products including everything from televisions and fridges to boilers, heat pumps and air conditioning systems.
The Ecodesign Directive deals with all aspects of product performance, from manufacture to transportation to market, use 
and disposal. When considering how to reduce the impact of a product, the EU legislation considers those stages of a 
product’s lifecycle that have the most impact on the environment.
 

The Ecodesign Regulation
The Ecodesign Regulation reflects this by setting minimum efficiency requirements and a new method of measuring performance 
has been introduced. The British Standard BS EN14825 sets the seasonal performance calculation for an air conditioning system. 
The use of more energy efficient equipment means that operational costs are lowered and the impact on the environment is reduced.
EN14825 uses the number of hours that is spent at each 
degree Celsius in a cooling season. Indoor temperature 
conditions are 27°CDB/19°CWB.

The 100% load condition is 35°C outdoor temperature. This is the same 
as nominal or rated conditions as indicated by the orange circle. We have 
a linear capacity profile and on average, below 15°C we no longer need 
cooling. The standard calls for equipment to be tested at 100%, 75%, 
50% and 25% part load conditions.
These relate to 35, 30, 25 and 20ºC ambient temperature respectively. 
At these four conditions the capacity and power input are tested and are 
used to calculate a spot EER. Each individual 1° increment is then given 
a calculated EER. Example:

The number of hours is multiplied by the spot capacity at each condition 
to give energy delivered at the particular ambient temperature. The EERs 
are used to calculate energy consumed. These figures are totalled to give 
an SEER when the unit is operating in cooling mode.
EN14825 - Heating
The “average” temperature/time profile is used for the 
UK heating season; we have many more hours between 
2°C and 7°C. Indoor temperature condition is 20°CDB.
The COPs are used to calculate energy consumed. These figures are 
totalled to give an SCOP when the unit is operating in heating mode. 
Example:

City Multi VRF HVRF Introduction

City Multi delivers the best possible 
performance, combined with total 
flexibility of design and operation.
City Multi VRF HVRF Introduction
The market-leading City Multi system offers complete flexibility in design, installation and 
operation with both heat recovery and heat pump models able to connect with up to 
50 indoor units per outdoor unit.
City Multi R32 VRF and HVRF units are ideal for customers looking to future-proof their air conditioning in line with the 
next stage of the F-Gas Regulations and the phase down of high Global Warming Potential (GWP) refrigerants.
R32 is now the refrigerant of choice for the majority of air conditioning systems because it offers a lower GWP (675) than 
R410A (2088) whilst complying with the latest legislation. Using these systems enables customers to enhance their 
CSR (Corporate Social Responsibility) with equipment that minimises the effect on climate change.
R32 is a single component refrigerant, meaning it is easier to reuse and to recycle. It is also relatively inexpensive to 
produce, is easier to handle because it doesn’t separate and utilises familiar technology, keeping costs similar. 
R32 is also low-toxic, is difficult to ignite and does not explode.


City Multi VRF 
(Variable Refrigerant Flow)
VRF is a direct expansion type air conditioning 
system where one outdoor unit is connected 
with multiple indoor units, intelligently 
modulating the flow of refrigerant depending 
upon the capacity requirements of each zone 
within the building.


It’s ultimate purpose is to regulate the internal room air temperature and comfort levels effectively and efficiently. Today’s commercial 
buildings are increasingly airtight and filled with heat-generating office equipment and lighting, which presents a challenge for anyone 
trying to maintain a stable and comfortable internal environment.
Constant development and innovation mean that City Multi VRF can be applied as both 
Heat Recovery and Heat Pump systems.


City Multi 
Hybrid VRF (HVRF)
HVRF is a type air conditioning system whereby the outdoor unit is connected with a 2-pipe heat 
recovery VRF system, and water is used between the Hybrid Branch Controller (HBC) and indoor 
units - instead of refrigerant. You can install and design the system as HVRF in the same way as 
other VRF systems, whilst enjoying the comfort levels normally associated with a chiller system.
Hybrid VRF offers a complete modern solution for office buildings, hotels, medical centres, schools, high-rise buildings, shopping 
centres and other commercial premises. Hybrid VRF is quick, easy & flexible to design and install, using the same control and 
network as VRF systems. Phased installation is possible, reducing cost and increasing productivity on site.

 
City Multi 
Hybrid VRF (HVRF)
HVRF is a type air conditioning system whereby the outdoor unit is connected with a 2-pipe heat 
recovery VRF system, and water is used between the Hybrid Branch Controller (HBC) and indoor 
units - instead of refrigerant. You can install and design the system as HVRF in the same way as 
other VRF systems, whilst enjoying the comfort levels normally associated with a chiller system.
Hybrid VRF offers a complete modern solution for office buildings, hotels, medical centres, schools, high-rise buildings, shopping 
centres and other commercial premises. Hybrid VRF is quick, easy & flexible to design and install, using the same control and 
network as VRF systems. Phased installation is possible, reducing cost and increasing productivity on site.


City Multi Hybrid Branch Controllers
At the heart of both Air Source and Water Source system layout, the HBC Controller makes simultaneous heating and cooling 
possible, with improved system efficiency as energy is transferred intelligently around the building.
The Horizontal and Vertical HBC Controllers are available as a 6, 8 or 16 port model. Valves, pumps, and the heat exchanger 
are all contained within the Main-HBC allowing for phased, manageable installation - ideal for Cat A to Cat B applications. An 
overall system can be expanded using additional horizontal Sub-HBC’s allowing up to 50 indoor units to be supplied by one 
outdoor condenser.


City Multi 
Range Overview
Mitsubishi Electric offers the most extensive range 
of VRF and HVRF systems with a wide choice of 
indoor units available on the market.

 
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City Multi VRF 
Features & Benefits
Wide range of connectable indoor units
Available for heat recovery and heat pump systems, our extensive range of indoor units 
comprises of over 80 indoor options ranging from 1kW to 25kW.
VRF systems can incorporate multiple indoor units, which can be located throughout a building. With advanced control logic, each 
system can provide optimum levels of comfort for any space. Our highly efficient indoor units can meet the cooling and heating needs 
of each area in a building, whilst also recovering heat and maximising the overall efficiency of the system.
The option to pump down and isolate the refrigerant within a VRF installation, and its ability to work alongside any leak detection 
system including standalone and aspirated, provides full safety and environmental protection from refrigerant leakage.
Options include: Ducted / Ceiling Cassette / Floor Standing / Wall Mounted / Ceiling Suspended / Air Curtains

 
City Multi YNW
The market-leading City Multi range is continually being updated to meet the ever-changing 
demands from the building services industry. We were the first to market with our innovative, 
patented HVRF technology, followed by the introduction of micro-channel heat exchangers 
that improve efficiency and reduce refrigerant volume.


We now also offer customers a future-proof solution that is fully flexible in design and reduces 
operating costs. R32 is a single component refrigerant, meaning it is easier to reuse and to 
recycle. With R32 less refrigerant is required and our ability to supply large, medium and 
small systems means that a single refrigerant can be used across an entire building or estate.
City Multi YNW has been designed to address some of the most 
fundamental challenges facing building designers today:


City Multi Mini VRF 
Features & Benefits
Utilising all the benefits of VRF technology, the City Multi Mini 
VRF PUMY models (10 to 33.5kW) have been designed with 
a focus on seasonal efficiency, making them ideal for 
discreet application environments.
City Multi PUMY units are designed to tackle the challenges of our modern 
urban environment, offering low noise levels and a range that enables outdoor 
units to be discretely installed out of the line of sight.
Depending on your application, there are two solutions available:
Single fan
Small footprint and height make this ideal for discreet location 
Standard 30Pa static fan allows outdoor units to be housed without 
affecting performance 
Cost effective and low refrigerant charge

Twin fan
High efficiency with longer pipe runs up to 300m total 
Optional 30Pa static fan (large units via dip switch) 
Low noise with best heating capacity available 
33.5kW from low impact chassis

City Multi Mini VRF units provide additional design flexibility when used as a Multi-Split system, 
connecting to City Multi, Mr Slim or our stylish M Series indoor units.
 
City Multi VRF Water Cooled 
Features & Benefits

The City Multi WR2 Series VRF system is ideal 
where a water loop is available and outdoor 
space is limited.
Efficiency can be optimised by networking the energy through a 
water loop both within and between buildings
System can utilise waste heat from commercial sources such as server cooling, or renewable heat from 
landlord loops, rivers, lakes or geothermal sources
Flexible VRF design, with the additional benefits of quiet operation and minimising the need for outdoor plant space
Offers additional heat recovery between the condensers, through the water loop
System provides continuous heating in winter, without the need for defrost operation
Advanced control options to increase or reduce water flow rate depending on unit’s operating condition


A sustainable and highly energy-efficient solution for tall buildings
Mitsubishi Electric now offers double heat recovery operation. The first heat recovery is within the refrigerant system. Heat is recovered 
between the indoor units to allow simultaneous cooling and heating operation.
The second heat recovery is within the water loop, where heat is recovered between the PQRY units. This double heat recovery 
operation substantially improves energy efficiency and delivers an ideal solution to the requirements of modern office buildings, 
where some areas require cooling even in winter.


City Multi HVRF 
Features & Benefits
This unique and innovative solution is based on a 2-pipe Heat Recovery VRF System but uses water 
as a heat exchange medium between the Hybrid Branch Controller (HBC) and the indoor units. 
As such, the system combines the comfort of a traditional hydronic system with the efficiency 
and ease of modern VRF air conditioning.
Using these systems enables customers to enhance their CSR (Corporate Social Responsibility) with equipment that minimises the 
effect on climate change. Energy efficient heat recovery operation is used to provide simultaneous heating and cooling. Efficiency 
is further optimised by utilising the centralised control and schedule function.
Wide range of connectable indoor units
The system can be expanded by using a combination of Sub-HBC boxes, allowing up to 50 indoor units, from ducted, 
ceiling cassette, floor mounted or wall mounted types to be supplied by one outdoor condenser.
Flexible application options
Air Source YNW (22-56kW) - Using the latest City Multi VRF YNW technology, including an aluminium heat exchanger, 
reduced weight and improved seasonal efficiency.
Water Source YLM (22-56kW) - Ideal where outdoor space is limited, building heat recovery and efficiency is 
demanded and a water loop is is available.
High sensible cooling and stable room temperatures
Typically 10% increase in sensible cooling vs standard VRF Provides a gradual rate of change of temperature within the 
air conditioned space, delivering a comfortable and stable environment.

HVRF provides the ideal solution for customers looking to future-proof their 
air conditioning in line with the next stage of the F-Gas Regulations and 
the phase down of high Global Warming Potential (GWP) refrigerants.
By combining R32 with the merits of a Hybrid system, more than an 
80% reduction in CO2 equivalent can be achieved as it uses up to 
40% less refrigerant, when compared to an R410A VRF system.
A comfortable and stable air temperature control is provided with 
no refrigerant in occupied spaces, meaning simple compliance 
with BS EN378 and removing the need for leak detection.
This makes City Multi HVRF ideal for:
This makes City Multi HVRF ideal for:
Hybrid Branch Controllers use R32, the lowest GWP refrigerant in the VRF market:
R32 refrigerant has a GWP that is 66 % lower than the traditional R410A refrigerantbr